Furnace for the heating of rivets or the like



Y A.TWER-. FURNACE FOR THE HEATING 0F RIVETS OR THE LIKE.

APPLICATION FILED JULY 22. I920.

1,404,331 Patented Jan. 24, 1922,

V/ I 4, SHEETS-SHEET ln, u w

A. TWER. FURNACE FOR THE HEATING 0F RIVETS 0R THE'LIKE.

APPLICATION FILED .IULY22| I920- 4 SHEETSSHEET 2.

Patented Jan. 24, 1922.

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- APPLICATION FILED JULY-'22. 1920.

TWER. FURNACE FOR THE HEATING 0F RIVETS OR THE LIKE.

m "an m "an. Mm m m Patented Jan. 24, 1922 A. TWER. FURNACE FOR THE HEATING 0F RIVETS OR THE LIKE. APPLICATION FILED JULY22. I920.

1 404 33 1 Q Patented Jan. 24 1922.

4 SHEETS-SHEET 4.

UNITED STATES PATENT OFFICE.

FURNACE FOR THE HEATING OF RIVETS OR THE LIKE.

Application filed July 22,

To all whom it may concern:

Be it known that I, ALBERT TWER, a citizen of the German Republic, and residing at Nassau-on-the-Lahn, Germany, have invented certain new and useful Improvement in Furnaces for the Heating of Rivets or the like, (for which I filed application in Germany, Dec. 15, 191 1, and Aug. 20, 1918,) of which the following is a specification, reference being had therein to the accompanying drawing.

This invention relates to furnaces known as hearth or flame furnaces, for the heating of rivet work and the like, in which the rivets are heated in the vertical position. It

is already known in such furnaces to suspend the rivets in the roof of the furnace, which operation however involves a rivet head and is objectionable on account of the breaking through of the roof. It is also'known to move the rivets through the furnace placed in an upright position on the surface of a horizontal wheel. This plan however involves a complicated construction. and an undesirable alteration of the furnace itself.

Toobviate the above drawbacks and, in addition, to enable the heating of rivets of various dimensions, so that rivets for different machines can be heated simultaneously in the same furnace, is the object of the present invention.

This invention is carried out by the arrangement that the rivets are placed in holoers of bars or in chain form, which holders can be inserted through side slots in the furnace walls and. be continuously moved through the furnace. If these holders, which are preferably formed like chains, be moved continuously through the slide slots, they may in this manner be connected immediately to various machines from which the rivets pass for the purpose of being'heated in the same furnace. The utilization of the furnace heat and the protectivity are in this manner very considerably increased.

The accompanying drawing shows a con struction of a furnace of this kind as follows:

Fig. 1 shows a. vertical section,

Fig. 2 a horizontal section,

Fig. 3 a transverse section.

Specification of Letters Patent.

Patented Jan. 24, 1922.

1920. Serial No. 398,230.

Figure 4 isa side elevation with a portion of the furnace in section.

Figure 1 is a similar view of the opposite end of the device.

Figure 5 is a vertical transverse section of the same.

In these figures, Fig. 1 indicates the fireplace. Fig. 2 the furnace chamber on the sole of which the holders 3, here shown as bars, are located for the reception of the rivets 4 placed upright on them. The insertion of these holders takes place through the 'side slots 5 which correspond to the troughs 6.

On the furnace described above the goods are placed in the upright position in barred or chain shaped holders, which holders are inserted through side slots in the furnace walls and continuously moved through the furnace. It is obvious that the application of chain shaped holders is preferable to the insertion of single bar shaped holders, because they need less handling and service.

The mechanical device for the continuous passing through of chain shaped holders being demonstrated in practice, several drawbacks in regard to the uniform heating of the rivets are found, and it can very easily occur that the rivets which come out of the furnace cool too quickly and, on further use,

prove no longer hot enough. It becomes therefore very desirable that the continuously working apparatus should be so arranged that the rivets after leaving the hearth of the furnace shall be removed from the chain shaped holders as quickly as ossible and be delivered to the working p ace. This condition is fulfilled in a special degree by the present invention.

In this invention, the rivets are also passed, by means of the holders falling closely one after the other, through a. slot in the wall of the furnace; but the holders are not connected one to another like a chain by pivoted connections. They are separate and independent one of another and lie in a channel without an end, in which they are pushed forward periodically by means of a forwarding device. The endless guidance is, therefore, not completely carried out by the holders which are placed close one after another, but there is an inter-space at the exit end of the holders about corresponding to the width of two consecutive holders. The

track of the holders through the furnace hearth is preferably horizontal and has at both ends semi-circular pieces connecting for the joining. of the upper and the lower track.

Upon this semi-circular part of the guide track, at the exlt polnt of the rivets where consequently there is no holder in the guide,

I there occurs, as all the holders advance, each time the result that the last holder passing out of the furnace turns over and falls with increasing rapidity downwards, through its own weight, and finally again takes position in contact with the previous holder.

7 vThrough this quiclreneddescent of the last holder, the rivets inserted in it are thrown out and fall into a receptacle (30) which forwards them again to another machine, one for instance for stamping the heads.

The forward motion of the holders in contact one with another is effected by a push- 7 bar with engagement catch, which engages behind a nose of the last holder with the track underneath, and thus pushes forward all the previous holders. 'The cold rivets to be heated are. inserted by the front end in the holder, which is again rising upwards.

The slot, through which the operation is carried on, is in the bottom of the furnace hearth under which theentire device (pref- V erably upon a travelling support with means at a time, in corresponding cavities of narrow holders, 8, which possess at their under 7 end at'both side's two consecutively arranged guide pins 9, preferably provided with rollers by means of which they are kept in the guide track. This track is formed of two sides 11 provided with guiding grooves 10.

The guiding grooves pass in two parallel tracks one above the other, and are connected 1n front and behind wlth semi-circular connecting pieces, so that an endless guide is formed. In this guide the holders 8 are arranged close together, leaving only aspace "at the front turning place where twoholders are left out. Each holder is provided at its inner end with a projection 12. Be

hind these there engages in the front holder 13, which has just come down from above to the lower track, a catch 14 which is located in a slide '16 moving in guides 15. This slide is moved in one direction by means of a lever 18 engaging behind a bolt 17 and n :the opposite direction by means of a weighted cord'20passing over a roller and engaging in a holder 19. The motion of the one-armed lever l8 is effected by a pro jection 21 of a continuously rotating wheel 22, and the )rojection 21 slides preferably upon a corresponding projection 23 on the lever 18. The motion of the wheel 22, providedwith worm gear, is effected by a shaft 2 1 which can be driven by a motor 26 with gearing placed upon a bracket 25.

The entire construction is preferably supported upon a frame 2'7, which is movable on rails by means of its wheels 28, so that it can be drawn underneath the furnace hearth and be brought into any desired position with regard to the furnace. The catch 1 serves, after each motion of the lever 18, to push the holder 8" into one division further so that the once foremost holder containing the hottest rivets at one end of Through the furt er operations to the respective .ma-

chines.

Having now particularly described and ascertained thenature of my said invention,

and in what manner the same is to be performed, I declare that whatI cla1mf1s:

1. An improved rivet heating furnace embodying a hearth or; flame furnace having slots," and endless holders continuously moved through thefurnace in said slots and the rivets held inuprightposition.

2, An improved rivet heating furnace embodying a heart-her flame furnace having slots, endless. holders continuously moved through the furnace in said slots and the rivets held in upright'position, and a guide track composed or parallel continuous horizontal membersiplaced one above the other and having semicircular connecting pieces at both ends and through which the holders freely pass unattached.

3. In a furnace for heating rivets, a hearth or flame furnace having slots, and endless holders continuously moved through the furnace in said'slots and the rivets held in upright position, the said holders having side projections.

i-gln' a ,furnace for heating rivets, a hearth or flame furnace having slots, endless holders continuously moved through the -furnace in said slots and the rivets held in upright position, the said holders having.

side projections, and a guide track with grooves in which said projections" are guided. 1

5. In a furnace .Eforheatingi rivets, a hearth or flame furnace having slots, endless holders continuously moved through the furnace in said slots and e rivets held in upright position, the said holders having side projections, and means to engage the foremost holder immediately after it has discharged the rivets and thus the whole row is pushed forward by one division.

6.111 a furnace for heating rivets, a hearth 0r flame furnace having slots, endless holders continuously 'moved through the furnace in said slots and the rivets held in upright position, the said holders having side projections, means to engage the foremost holder immediately after it has discharged the rivets and thus the whole row is pushed forward by one division, a carrier, and means whereby the carrier is restored to normal position.

7. In a furnace for heating rivets, a hearth or flame furnace having slots, endless holders continuously moved through the furnace in said slots and the rivets held in upright position, the said holders having side projections, a guide track with grooves in which said projections are guided, and means whereby the entire rivet guiding means and its gearing is placed upon a traveling carriage which can be brought into the furnace hearth in every position.

8. The improved rivet heating furnace with continuous independent moving rivet holders and travelling frame, adapted to supply the furnace with rivets continuously in any position; substantially as described and shown in the drawings.

In testimony whereof I affix my signature in the presence of two witnesses.

ALBERT TWVER. 

